C#实现文本文件读写方法汇总
内容摘要
方法一:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using
文章正文
方法一:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 | using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; using System.IO; namespace txt { public partial class Form1 : Form { // string path; public Form1() { InitializeComponent(); button3.Click+=button3_Click; } private void textBox2_TextChanged(object sender, EventArgs e) { string path1 = textBox2.Text; if (!File.Exists(path1)) { MessageBox.Show( "文件不存在" ); } } //浏览按钮 private void button3_Click(object sender, EventArgs e) { /*if (folderBrowserDialog1.ShowDialog() == DialogResult.OK) { string selUrl = folderBrowserDialog1.SelectedPath; }*/ OpenFileDialog ofd = new OpenFileDialog(); if (ofd.ShowDialog() == DialogResult.OK) { textBox2.Text = ofd.FileName; } //选择文件夹 /* FolderBrowserDialog fbd = new FolderBrowserDialog(); fbd.ShowDialog(); MessageBox.Show(fbd.SelectedPath); */ } //读取文件 private void button1_Click(object sender, EventArgs e) { if (textBox2.Text!=null) //读取文件内容并显示在textbox1中让用户修改 { string path=textBox2.Text; if (File.Exists(path)) // { // File.Delete(path); // } textBox1.Text = File.ReadAllText(path, Encoding.Default); } } private void button2_Click(object sender, EventArgs e) { // string[] appendText=textBox1.Text; File.WriteAllText(textBox2.Text, textBox1.Text, Encoding.Default); MessageBox.Show( "保存成功" ); } } } |
方法二:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 | namespace 文本文件打开测试 { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void btn_Read_Click(object sender, EventArgs e) { //异常检测开始 try { FileStream fs = new FileStream(@tB_PachFileName.Text , FileMode.Open, FileAccess.Read); //读取文件设定 StreamReader m_streamReader = new StreamReader(fs, System.Text.Encoding.GetEncoding( "GB2312" )); //设定读写的编码 //使用StreamReader类来读取文件 m_streamReader.BaseStream.Seek(0, SeekOrigin.Begin); // 从数据流中读取每一行,直到文件的最后一行,并在rTB_Display.Text中显示出内容 this.rTB_Display.Text = "" ; string strLine = m_streamReader.ReadLine(); while (strLine != null) { this.rTB_Display.Text += strLine + "\n" ; strLine = m_streamReader.ReadLine(); } //关闭此StreamReader对象 m_streamReader.Close(); } catch { //抛出异常 MessageBox.Show( "指定文件不存在" ); return ; } //异常检测结束 } private void btn_Replace_Click(object sender, EventArgs e) { //判断替换开始 if (tB_Replace.Text == "" &&tB_Replace_2.Text== "" ) { MessageBox.Show( "想替换的字符都没有就换啊,你太有才了" ); } else { if (rTB_Display.Text == "" ) { MessageBox.Show( "文件内容为空无法进行替换,请检查文件" ); } else { string str = rTB_Display.Text.ToString(); rTB_Display.Text = str.Replace(@tB_Replace.Text ,@tB_Replace_2.Text); //替换 } } //结束 } private void btn_Save_Click(object sender, EventArgs e) { //异常检测开始 try { //创建一个文件流,用以写入或者创建一个StreamWriter FileStream fs = new FileStream(@tB_Save.Text, FileMode.OpenOrCreate, FileAccess.Write); StreamWriter m_streamWriter = new StreamWriter(fs); m_streamWriter. Flush (); // 使用StreamWriter来往文件中写入内容 m_streamWriter.BaseStream.Seek(0, SeekOrigin.Begin); // 把richTextBox1中的内容写入文件 m_streamWriter.Write(rTB_Display.Text); //关闭此文件 m_streamWriter. Flush (); m_streamWriter.Close(); } catch { //抛出异常 MessageBox.Show( "写入文件失败,请检查路径 文件名与权限是否符合" ); } //异常检测结束 } } } |
方法三:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 | //写入文本文件 class WriteTextFile { static void Main() { //如果文件不存在,则创建;存在则覆盖 //该方法写入字符数组换行显示 string[] lines = { "first line" , "second line" , "third line" , "第四行" }; System.IO.File.WriteAllLines(@ "C:\testDir\test.txt" , lines, Encoding.UTF8); //如果文件不存在,则创建;存在则覆盖 string strTest = "该例子测试一个字符串写入文本文件。" ; System.IO.File.WriteAllText(@ "C:\testDir\test1.txt" , strTest, Encoding.UTF8); //在将文本写入文件前,处理文本行 //StreamWriter一个参数默认覆盖 //StreamWriter第二个参数为false覆盖现有文件,为true则把文本追加到文件末尾 using (System.IO.StreamWriter file = new System.IO.StreamWriter(@ "C:\testDir\test2.txt" ,true)) { foreach (string line in lines) { if (!line.Contains( "second" )) { file.Write(line); //直接追加文件末尾,不换行 file.WriteLine(line); // 直接追加文件末尾,换行 } } } } } //读取文本文件 class ReadTextFile { static void Main() { //直接读取出字符串 string text = System.IO.File.ReadAllText(@ "C:\testDir\test1.txt" ); Console.WriteLine(text); //按行读取为字符串数组 string[] lines = System.IO.File.ReadAllLines(@ "C:\testDir\test.txt" ); foreach (string line in lines) { Console.WriteLine(line); } //从头到尾以流的方式读出文本文件 //该方法会一行一行读出文本 using (System.IO.StreamReader sr = new System.IO.StreamReader(@ "C:\testDir\test.txt" )) { string str; while ((str = sr.ReadLine()) != null) { Console.WriteLine(str); } } Console.Read(); } } |
以上所述就是本文的全部内容了,希望大家能够喜欢。
代码注释